Suspension
Ball Joints
Ball joints connect the control arms to the steering knuckle so the wheel can steer and move.
Free guide
Advertisement
What it does
- Provide a pivot between suspension and wheel
- Allow steering and vertical motion
- Carry vehicle weight in some designs
When it fails
- Clunking over bumps
- Steering wander
- Uneven tire wear
- Visible grease loss or play
How to diagnose
- Jack the wheel and pry to feel for play
- Inspect the rubber boot for tears
- Check for grease loss
Maintenance
- Replace worn joints promptly — failure means the wheel collapses
- Torque to spec with the suspension loaded
Use the diagnosis order. When a part fails, confirm each hypothesis with measurements before replacing anything — codes and symptoms overlap.
Related part
Tie Rod Ends
Tie rod ends link the steering rack to the wheels so your steering input turns the wheels.